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Posted to mapreduce-issues@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2015/03/03 11:17:06 UTC

[jira] [Updated] (MAPREDUCE-5583) Ability to limit running map and reduce tasks

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junping Du updated MAPREDUCE-5583:
----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.7.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I have commit this patch to trunk and branch-2. Thanks [~jlowe] for the patch and [~yanghaogn], [~kasha] for review!

> Ability to limit running map and reduce tasks
> ---------------------------------------------
>
>                 Key: MAPREDUCE-5583
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5583
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.9, 2.1.1-beta
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>             Fix For: 2.7.0
>
>         Attachments: MAPREDUCE-5583-branch2.4.1.patch, MAPREDUCE-5583v1.patch, MAPREDUCE-5583v2.patch, MAPREDUCE-5583v3.patch, MAPREDUCE-5583v4.patch
>
>
> It would be nice if users could specify a limit to the number of map or reduce tasks that are running simultaneously.  Occasionally users are performing operations in tasks that can lead to DDoS scenarios if too many tasks run simultaneously (e.g.: accessing a database, web service, etc.).  Having the ability to throttle the number of tasks simultaneously running would provide users a way to mitigate issues with too many tasks on a large cluster attempting to access a serivce at any one time.
> This is similar to the functionality requested by MAPREDUCE-224 and implemented by HADOOP-3412 but was dropped in mrv2.



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